<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="../react18/react.development.js"></script>
    <script src="../react18/react-dom.development.js"></script>
    <script src="../react18/babel.min.js"></script>
</head>
<body>
  <div id="app"></div>
  <script type="text/babel">
      function Title(){
          return <h1>hello,你好啊</h1>
      }
       
      function Conste(){
          return<p>我是今天的内容</p>
      }

    //最外层的组件被称作为根组件
      function App(){
          return(
              <div>
            <Title/>
            <hr/>
            <Conste/>
             </div>
          )
      }
    // root.render(<App/>)这个是要大写的，否则会报错

    const root =ReactDOM.createRoot(document.getElementById('app'));
    root.render(<App/>)
    
    </script>
</body>
</html>